<?php
/**
 * Smarty plugin
 *
 * @package Smarty
 * @subpackage PluginsModifier
 */

/**
 * Smarty truncate modifier plugin
 *
 * Type:     modifier<br>
 * Name:     truncate<br>
 * Purpose:  Truncate a string to a certain length if necessary,
 * optionally splitting in the middle of a word, and
 * appending the $etc string or inserting $etc into the middle.
 *
 * @link http://smarty.php.net/manual/en/language.modifier.truncate.php truncate (Smarty online manual)
 * @author Monte Ohrt <monte at ohrt dot com>
 * @param string $string input string
 * @param integer $length lenght of truncated text
 * @param string $etc end string
 * @param boolean $break_words truncate at word boundary
 * @param boolean $middle truncate in the middle of text
 * @return string truncated string
 */
function smarty_modifier_truncate($string, $length = 80, $etc = '...', $break_words = false, $middle = false) {
	if ($length == 0)
		return '';
	
	if (is_callable ( 'mb_strlen' )) {
		if (mb_detect_encoding ( $string, 'UTF-8, ISO-8859-1' ) === 'UTF-8') {
			// $string has utf-8 encoding
			if (mb_strlen ( $string ) > $length) {
				$length -= min ( $length, mb_strlen ( $etc ) );
				if (! $break_words && ! $middle) {
					$string = preg_replace ( '/\s+?(\S+)?$/u', '', mb_substr ( $string, 0, $length + 1 ) );
				}
				if (! $middle) {
					return mb_substr ( $string, 0, $length ) . $etc;
				} else {
					return mb_substr ( $string, 0, $length / 2 ) . $etc . mb_substr ( $string, - $length / 2 );
				}
			} else {
				return $string;
			}
		}
	}
	// $string has no utf-8 encoding
	if (strlen ( $string ) > $length) {
		$length -= min ( $length, strlen ( $etc ) );
		if (! $break_words && ! $middle) {
			$string = preg_replace ( '/\s+?(\S+)?$/', '', substr ( $string, 0, $length + 1 ) );
		}
		if (! $middle) {
			return substr ( $string, 0, $length ) . $etc;
		} else {
			return substr ( $string, 0, $length / 2 ) . $etc . substr ( $string, - $length / 2 );
		}
	} else {
		return $string;
	}
}

?>